Simple Clean Android E-commerce App

I need an Android e-commerce application for selling physical goods. The design should be simple and clean.

Key Requirements:
- Android platform support
- Design: Simple and Clean
- Functionality to browse and purchase physical goods

Ideal Skills and Experience:
- Experience in developing Android e-commerce applications
- Strong UI/UX design skills for creating clean and simple interfaces
- Knowledge of secure payment integration and user authentication

Please provide samples of previous work and an estimated timeline.